Brake drum and method of making same



July 27, 1937. v o. F. GOTTLIEB ET AL BRAKE DRUM AND METHOD OF MAKING 'SAME Filed July 22, 1955' 2 Sheefs-Sheet 1 CZQZ Faber/Duane,

Jufiy 27, 1937. o. F. GOTTLEEB ET AL ifl 'fi BRAKE DRUM AND METHOD OF MAKING SAME Filed July 22, 1935 2 Sheets- Sheet 2 Patented .luly27, i931 I v 2,037 907. r

STATES PATENT oFFicE BRAKE DRUM AND METHOD. OF MAKING SAME.

Oscar F. Gottlicb. Lake Blufl,and Charles Robert Duncan, Walukegan, Ill., assignors to Oakes Products Corporation, North Chicago, IlL, a corporation of M'chigan Application July 22, 1935, Serial No. 32,532

' 2 Claims. (Cl. 29-1522) This invention relates to a brake drum assemcup-shaped member It having a reduced neck bly and to a method of making the same. More portion I receives the flanged end l3 of said particularly, the invention pertains to the manuhub portion and is secured thereto. A drum facture of a brake drum of brazed construction member I6, secured to said cup-shaped member formed from a forged hub and a sheet metal l4 through its web 11, encloses said cup-shaped 5 drum portion. member to provide an annular flange [8 consti- It has heretofore been customary to manufactuting the braking surface. A plurality of ribs ture brake drums by a relatively elaborate and or fins l9 and 20 are secured about the outer peexpensive process. We have now found, however, riphery of the flange I8 to increase the cooling 1 that a satisfactory brake drum can be manuefficiency of the drum. l0

factured at much lower cost by making the drum The web ll of the drum may be provided with in several parts from forgings and stampings a plurality of openings 29 to permit air circulation and brazing the parts together by means .of a through the brake drum and also with struck-up copper brazing material in a reducing atmosportions 22 that cooperate with lugs 23 in sephere. curing the wheel on the spindle i2 and holding it 15 It is therefore an important object of this inin place thereon. vcntion to provide a brake drum assembly that Both the cup-shaped member l4 and the drum can be manufactured relatively inexpensively it are formed from sheet metal by suitable die from forgings and stampings by brazing the parts Stamping and drawing operations. As shown in go together in a reducing atmosphere. Fig. 3, certain edges of the hub, cup-shaped mem- It is a further important object of this invenber and drum web are beveled or cnam 110 tion to provide a method of making brake drum p v de, When the Parts are assembled, Clearassemblies of brazed construction, wherein the ances for the positioning of brazing wires, such brazing is effected by means of a copper brazing as the wires'2 l, 25 and 2B. .The assembled parts material in a reducing atmosphere, such as arethen heated to a temperature above the melthydrogen or the like. .ing point of the brazing material, such as copper Other and further iniporta'nt objects ofthis or brass, in a reducing atmosphere, wh r ninvention will be apparent from the disclosures the'b a ne a a flows in between the abutin the specification and the accompanying drawting surfaces, as indicated at 21, 28 and 29 (Fig.2),

Q .ings. toprovide a firm braze at those join While This invention (in a preferred form) is illus-' these brazed joints are pictorially represented as trated in the drawings and hereinafter more fully distinct layers of some relative thickness, actually described. the metal surfaces are in close contact and are On the drawings; brazed directly together without any intervening Figure 1 15a plan view of a, brake dru assem continuous layer of the brazing material. The bly embodying the principles of our invention. brazing metal W the surfaces of the parts to Figure 2 is ,a sectional view taken substantially be joined under t e t pe a u obtaining in a on the line II-II of Fig. 1. furnace having a reducing atmosphere and flows Figure 3 'is a. fragmentary enlarged sectional readily between said surfaces despite the closefit .40 View of the same brake drum at one point of its ness of fit. In fact, the closer the fit of the va- 40 manufacture. rious parts, the stronger will be the braze effected. Figure 4 is a fragmentary enlarged sectional. It will be understood, of course, that it is not I view of a modified form. of brake drum assembly. n ssary t vel off th d es f th variou Figure 5 is a. fra mentary enlarged sectional parts, as indicated in Fig. 3, to provide spaces view of a further modification of the invention. r h bra n Wi s 25 nd si these 45 Figure 6 is a fragmentary enlarged sectional wires may be laid in position adjacent the joints, view of a further modification of the invention. r n top of them- Wh pp r wires re used.

As shown on the drawings: welding temperatures of around 2000 and In Figs. 1 to 3 inclusive, the reference numeral 2050 F. are satisfactory, while with brass braz- It indicates generally abrake drum assembly ing wires, thete pe s y be in the n i 50 embodying the principles of our invention. borhood of 1800 to -1850 F. Said brake drum assembly l0 comprises a hub Figs. 4, 5 and 6 show modifications of construcportion ll forged from suitable metal stock to tion. In Fig.4, the reference numeral 30 indiprovide a spindle l2 and a. flange l3 on the inner cates a. wheel-receiving spindle having an inend and normal to the axis of said spindle. A tegrally formed skirt or cup-shaped member 3|, 55

the whole being produced by suitable forging operations. A drum member 32 is secured along the inner periphery of the web portion 33 to the shoulder 34 formed between the cup-shaped member or skirt 3| and the spindle 30. This may be accomplished by brazing the two parts together with a suitable copper or brass brazing material in areducing atmosphere.

In Fig. 5, the spindle and hub portion, indicated generally by the reference numeral 35, is forged from suitable metal stock to provide a radially extending flange 36, to which is brazed the web portion of a drum 3! formed of stamped metal. A second sheet metal stamping 38 of annular shape and provided with concentric flanges 39 is brazed to the inside of the web 31 and also to the outer periphery of the flange 36, as at 40 and ll, respectively.

In Fig. 6, the hub portion constitutes a forging that provides a spindle 42, a web portion 43 extending normally thereto, an inner annular flange 44 and an outer peripheral-flange 45. The outer flange 45 is recessed, as at 46, to receive the flanged periphery of a drum 4! that is adapted inner cup-shaped member, or skirt, may either be formed integrally with the spindle as apart of the hub forging or may be formed from sheet metal by suitablestamping and drawing operations. Theparts are then brazed together by means of a copper containing brazing material and by the use of a reducing atmosphere, such as an atmosphere ,of' hydrogen, carbon monox-,

ide or mixtures thereof; This makes for considerable economy in the manufacture of brake drums as compared with the cost of manufacturing forged brake drums as heretofore practiced.

The cup-shaped member I! is applied over the flange I 3 of the spindle I! by suitable manufacturing methods, such, for example, as by spin- -ning, thus forming the neck l5.

The purpose of the member i4 is to provide a cup for receiving bearings for the axle, which extends through the member it into the taper of the spindle l2, the bearings lying between the axle and the inner surface of the member I! as is well understood in the art.

We are aware that many changes may be made and numerousdetails of construction may be varied through a widerange without departing from the principles of this invention, and we, therefore, do not purpose limiting the patent granted hereon otherwise than necessitated by the prior art.

We claim as our invention:

l. A brake drum assembly, comprising a forged metal hub having a wheel-receiving spindle and an annular flange normal to the axis of said spindle, a stamped and drawn cup-shaped'member of sheet metal receiving said hub and brazed to said flange and spindle, and a drum of stamped and drawn sheet metal brazed to said cup-shaped member and enclosing the same.

2. The method of making a brake drum assembly which comprises forging a spindle with a flange to form a hub, stamping and drawing sheet metal to provide a cup-shaped member for receiving said flange, stamping and drawing sheet metal to form a drum for attachment to said flange, and copper brazing said flange, cupshaped member and drum together in a reducing atmosphere.

OSCAR F. GO'I'ILIEB. CHARLES ROBERT DUNCAN. 

